I see I owe you an explanation.
At that point in time, History migrated that question and another one to HSM, confusing most of us and sparking a second meta discussion on History. The community collectively decided to close the questions, thus rejecting the migration and sending it back to History, because it already had perfectly fine answers (deleted here automatically; this is not what happened on the other question, which is, come to think of it, odd), which had been migrated here with the question.
"Off-topic" was merely the close reason we chose; see the meta post.
It is also a complete coincidence that the only other non-CM-users who voted to close are now moderators (LoganM and I); this was before we had mods. The decision was made by the community and finalized by Pops; see his meta answer.